## Calculate panel efficiency changes with temperature

##### Solar Mango has 8 different calculators.View here ### Panel Efficiency Variation With Temperature

• Did you know that even the most efficient solar panels will be affected by rise in temperature
• The temperatures developed within panels will be much higher than the outside temperatures, resulting in decrease from stipulated efficiencies
• Based on it, we will calculate the actual efficiency that will be reached by your panels

# Panel Efficiency Variation With Temperature

 Panel efficiency provided by manufacturer (This will be at 25 oC Standard Test Conditions – STC) % Usual Temperature In Your Area oC

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[insert_php]
\$message=””;
echo \$message;
if((isset(\$_POST[‘panel_efficiency’]))&&(isset(\$_POST[‘temperature’]))) {

if((!empty(\$_POST[‘panel_efficiency’]))&&(\$_POST[‘temperature’])) {
\$servername = ‘localhost’;
\$dbname = ‘solarman_tools’;
// Create connection

mysql_select_db(\$dbname, \$conn );

\$I1 = \$_POST[“panel_efficiency”];
\$I2 = \$_POST[“temperature”];
\$I3 = \$I2 + 20;
\$date= date(‘Y-m-d’);

\$sql = “INSERT INTO `efficiency_temp` (`panel_efficiency`, `temperature`, `date`, `ip`) VALUES (‘\$I1′,’\$I2′,’\$date’, ‘\$ip’)”;
if (mysql_query(\$sql) === TRUE) {

} else {
echo “Error: ” .mysql_error() . “
“;
}
mysql_close(\$conn);

echo “

## Calculated panel efficiency

Inputs

 Panel efficiency at STC (25 oC): \$I1 % Usual temperature in your region : \$I2 oC

Results

Panel efficiency at given temperature (\$I2 oC): \$answer %

Assumptions
• Calculation assumes a temperature coefficient of -0.45%/oC. Please check the manufacturer’s datasheet for actual thermal coefficient.
• Panel temperature developed will be usually 20 oC above ambient temperature.

“;

}
else{

echo “